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Background The IgG autoantibody ANNA-2 (anti-Ri) is a type 2 antineuronal antibody that has been found to bind to highly conserved and widely distributed adult brain proteins encoded by the Nova-1 and Nova-2 genes. Anti-Ri antibodies are typically detected in the serum and cerebrospinal fluids of patients with neurological disorders such as opsoclonus/myoclonus and cerebellar ataxia and in association...